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Error code 4BDC: Fuel presupply control - X5 E70 35D

4BDC: Fuel pre-supply control

If you're experiencing this code the first thing I would do is replace the fuel filter, clear codes, drive normal, see if the code comes back.

If code comes back, replace fuel line with presupply control pressure sensor/temp sensor, this is a common issue.

https://www.tunemyeuro.com/low-pressure-fuel-sensor-and-temp-sensor-fuel-line-genuine-bmw-13537806960/